The demon king known for his ability to shapeshift in various mythologies is Ravana, the antagonist of the *Ramayana*. In Hindu tradition, Ravana possesses the mystical power to change his form, allowing him to outsmart his enemies and manipulate situations to his advantage. His character embodies traits of intelligence, cunning, and ambition, representing the darker aspects of desire and power. Ravana's shapeshifting abilities highlight the theme of illusion in mythology, illustrating how appearances can be deceiving, and the consequences of unchecked ambition in human nature.